Q. The object glass provides a virtual inverted image in front of the eyepiece which in turn magnifies the image to produce a real erect image in surveyors telescope.

View solution

Q. The line of sight is also called _____

View solution

Q. What is the line which passes through the optical centres of objective and eye piece?

View solution

Q. The eyepiece magnifies the cross hairs.

View solution

Q. The focal length of an objective varies with eyepiece.

View solution

Q. The establishment of line of sight, therefore, involves the following two essential conditions, the real image must be formed in front of the eyepiece, the plane of the image must coincide with that of the cross hairs.

View solution

Q. The operation of forming or bringing the clear image of the object in the plane of cross hairs is known as ______

View solution

Q. A level provides a vertical line of sight, a line tangential to a Level surface at the point where the instrument stands.

View solution

Q. The theory of direct levelling neglects _____

View solution

Q. Which of the following methods of spirit levelling is, levelling the object of which is solely to determine the difference in elevation of two points regardless of the horizontal position of the points with respect to each other?

View solution

Q. Fly levelling is another name of _____

View solution

Q. Which of the following methods of spirit levelling is, levelling the object of which is solely to determine the elevations of points at measured intervals along a given line?

View solution

Q. Cross sectioning is the process of taking levels on each side of a main line tangential to that line.

View solution

Q. Which of the following methods of spirit levelling is, levelling in which the difference in elevation between two points is accurately determined by two sets of reciprocal observations?

View solution

Q. Which of the following methods of spirit levelling is, levelling in which the degree of precision required is too great to be attained by ordinary methods?

View solution

Q. What is the height of instrument, if elevation of benchmark is 200.852 m, back sight is 2.324 m, fore sight is 1.836 m?

View solution

Q. What is the elevation of a point, if the elevation of a benchmark is 200.852 m, back sight is 2.324 m, foresight is 1.836 m?

View solution

Q. By balancing back sight and fore sight error due to curvature can be eliminated.

View solution

Q. By balancing back sight and fore sight error due to non parallelism of the line of collimation can be eliminated.

View solution

Q. By which of the following, the difference in elevation between two points can be calculated by taking a difference between the two readings and no correction for the inclination of the line of sight is necessary?

View solution